Frustrated customer

I signed with Matrix on the 14th of June I am getting paid on the 20th gave them everything even gave them my friends contact number she also signed with them I took a cover for tracking my carthere was also a add on of my cellphone for incase my screen is broken signed for it aswell they debited R360 something saying it's pro rata for June and July again August they debited mever missed any payment I phoned them on the 28th of August for booking my broken cellphone one of the booking urgets called and asked for my details gave him he came back saying my account is in arrears I must call Matrix I phoned checked if my account is in arrears they confirmed with an email saying the account is not in arrears phoned the booking urgent now he says he won't take anything coming from me Matrix must call them called them again sent emails after emails not getting any help sent my last email saying I want to cancel because it shows l won't get any help imagine if I wanted to put a claim for my car then I get this I am so disappointed